+(defun base64-decode-string (string)
+ "Decode STRING which is encoded in base64, and return the result.
+This function calls internal base64 decoder if size of STRING is
+smaller than `base64-internal-decoding-limit', otherwise it calls
+external base64 decoder specified by `base64-external-decoder'. In
+this case, you must install the program (maybe mmencode included in
+metamail or XEmacs package)."
+ (interactive "r")
+ (if (and base64-internal-decoding-limit
+ (> (length string) base64-internal-decoding-limit))
+ (base64-external-decode-string string)
+ (base64-internal-decode-string string)
+ ))
+
+
+;;; @ base64 encoder/decoder for file
+;;;
+
+(defun base64-insert-encoded-file (filename)
+ "Encode contents of file FILENAME to base64, and insert the result.
+It calls external base64 encoder specified by
+`base64-external-encoder'. So you must install the program (maybe
+mmencode included in metamail or XEmacs package)."
+ (interactive (list (read-file-name "Insert encoded file: ")))
+ (apply (function call-process) (car base64-external-encoder)
+ filename t nil (cdr base64-external-encoder))
+ )
+
+(defun base64-write-decoded-region (start end filename)
+ "Decode and write current region encoded by base64 into FILENAME.
+START and END are buffer positions."
+ (interactive
+ (list (region-beginning) (region-end)
+ (read-file-name "Write decoded region to file: ")))
+ (as-binary-process
+ (apply (function call-process-region)
+ start end (car base64-external-decoder)
+ nil nil nil
+ (append (cdr base64-external-decoder)
+ base64-external-decoder-option-to-specify-file
+ (list filename))
+ )))
+